Means for and method of applying antioffset material to freshlyprinted sheets



@ch 9 11923. 11AW345 H M. BARBER MEANS FOR AND METHOD OF APPLYINGANTIQFFSET MATERIAL T0 FRESHLY PRINTED SHEETS w Filed Feb. 20. 1922 2Sheets-Shee't 1 IN VEN TOR Bl A TTORNE Y6 @ch 9 R$2E ii mfififi H. M.BARER MEANS FOR AND METHOD OF APPLYING ANTIOFFSET MATERIAL- TO FRESHLYPRINTED SHEETS Filed Feb. 20. 1922 =5 :5 E E E: .5 E5 :5

INVENTOR fl /M Wt, 759% B2 A TTORNE 149 Patented Get. 33, 19235.

HOWARD .llll'. BARBER, F STONINGTON, CONNECTICUT, ASSIGNOR T0 C. B.COTTRELL dz SON S OOMIPANY, OF NEW Y0, N. Y., A CORPORATION OF DELAWARE.

MEANS FOR AND METHOD BF APPLYING ANTIOFFSET MATERIAL T0 FEESEILY-PRINTED SHEETS.

Application filed Eeluuary 20, 1922. Serial No. 537,835.

To all whom it may concern:

Be it known that'l, Howard) M. BARBER,

a citizen of the United States, and resident of Stonington, in thecounty of New Leudon and State of Connecticut, have invented a new anduseful Improvement in Means for and Methods of Applying AntioifsetMaterial to Freshly-Printed Sheets, of which the following aspecification.

In the printing art it frequently happens that only a portion orportions of a freshly printed sheet requires the use of anantioffsetting medium, as for instance where only a portion or portionsof the sheet are "M3 printed or where only a portion or portions of thesheet are heavily printed and the balance of the sheet lightly printed.Slip sheets must be substantially the size of the printed sheets and theslip sheets are not only expensive but require complicated machinery forproperly introducing them between and separating them from the printedsheets. Where anti-offset material has been used heretofore. it has beena plied to the 2 entire sheet and not only resu tsin a considerableexpense, but also requires the use of complicated apparatus for removingthe surplus material from the sheets.

The object of my invention therefore is to provide a novel means for andmethod of treating freshly printed sheets especially color sheets, byapplying an anti-offset material in liquid or powder form onto the backof the freshly printed sheet opposite a predetermined portion orportions thereof, to prevent offset from the next adjacent sheet in thepile after delivery.

My invention includes means whereby the backs of the freshly printedsheets opposite so heavily printed portions thereof are treated withantioifset material, leaving the portions opposite the lightly printedor unprinted portions of the sheet untreated.

My invention more particularly includes as providing a member with oneor more relief portions corres ending in outline to and adapted toreglster with a predetermined heavily printed portion or ortions of thefreshly printed sheet, means ing employed so for applying theanti-ofiset material in liquid or powder form to said relief portion orortions for transfer thereb onto the bee of the sheet opposite saipredetermined heavily printed portion or portions.

mined heavily printed A practical embodiment of my invention isrepresented in the accompanying drawings, in which the invention 1sshown as applied to a multi-c-olor rotary sheet printin press.

*ig. 1 represents a longitudinal vertical central section through aportion of a multicolor printing press with my anti-ofi'set materialapplying mechanism-shown in connection therewith.

'Fig. 2 represents an exaggerated detail section of the anti-offsetmaterial applying 6 and 7 with their respective sheet carrying headgrippers 8 and 9. The sheet feed cylinder 10 is provided with a set ofhead,

grippers 11 for feeding the sheets from any suitable source of supply tothe impression cylinder. The printed sheet delivery reel 12 may beprovided with a set of head grippers 13 for taking the freshly printedsheets from the impression cylinder and deliverinw them to any suitablepoint.

The means which I have shown for a lying anti-ofi'set material either inliquid or powder form to the back of the freshly printed sheet oppositea predetermined portion or portions thereof, is herein shown as a rotarycylinder 14, having one or more relief portions corresponding in outlineto and in registry with predetermined heavily printed portion orportions of the freshly printed sheet, said cylinder 14 bein arranged toapply the anti-ofiset materia onto the back of the sheet opposite thepredeterortion or portions thereof while the fresh y printed sheet isbeing delivered. Friction pulle s 15 are placed opposite the longitudinamargins of the sheet for the purpose of holding the sheet against thecylinder 14: with a pressure sufiicient to cause the anti-od'set mate.rial to transfer from the relief portion or portions of the cylinder 14:on the baclr of the sheet. i

One way of providing the cylinder 1a with till a relief portion orportions would be to wrap the proof 16 around the cylinder 14 in properregister with respect to the freshly printed sheet and then build up therequired portions of the proof to form reliefs, such as 17 voir to therelief portions 17,18, on the cylinder 14 for transfer thereby onto theback of the freshly printed sheet opposite the heavily printed portionsthereof as the sheet passes from the delivery reel 12. The roll 21 iscarried inadjustabIe bearings 22 so that it may be set in properadjustment to both the roll 20 and the relief form carried by thecylinder 14. It may be desirable to use a blade 23 for regulating thesupply of the anti-offset material from the roll 20 to the roll 21.

From the above description it will be seen that by the use. of myinvention I am enabled to apply anti-offset material in liquid or powderform to the back of the freshly printed sheet opposite that portion; orportions onl which require treatment to prevent offset rom the nextadjacent sheet in the pile. This arrangement results in a considerablesaving of the anti-offset material which is of-great importance and alsoeliminates thene'cessity of utilizing complicated and expensivemachinery for removing excess anti-ofi'set material from the freshlyprinted sheet.

This invention is particularly well adapted for use in connection withcolor work Where certain portions of the sheet are provided with muchheavier application of the color than other portions thereof, the backof the sheet opposite said heavier portions re uiring treatment forpreventing ofi'set. t is evident that various changes may be made in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention, hence, I do notwish to limit myself to the articular embodiment herein shown andescribed, but

What I claim is:- 1. Sheet printing and delivery mechanisms, and meanscoacting with the delivery printed portion anti-offset mateoffsetmaterial onto said relief portion for transfer thereby onto the back ofthe sheet.

4. Sheet printing and delivery mechanisms, a cylinder coacting with thedelivery mechanism and having a proof applied thereto in registry withthe printed sheet, said proof having a relief portion corresponding 1noutline to that portion of the sheet to which the anti-offsetmaterial'is to be applied, and means for applying the anti-offsetmaterial onto said relief portion for transfer thereby onto the back ofthe sheet.

5. The method of preventing offset from a freshly printed sheet onto thenext adjacent sheet of a pile consisting in applying anti-offsetmaterial onto the back of the freshly printed sheet opposite apredetermined printed portion thereof.

6. The method of preventing offset from a freshly cent sheet of apileconsisting in applying anti-offset material onto the back of the freshlyprinted sheet opposite a predetermined heavily printed portion thereof.

printed sheet onto the next adja- 7. The method of preventingofi'setfrom a freshly printed sheet onto the next adjacent sheet of apile consisting in produc1ng a member havin a relief portloncorresponding to and in registry with a predetermined portion of thesheet, applying anti-offset material to said relief portion, andtransferring the anti-offset material from said relief portion onto theback of the freshly printed sheet opposite the portion that correspondsto the said relief portion.

In testimony that I claim the foregoing as my invention, I have siggedmy name this 17th day of February, A. 1922.

HOWARD M. BAR-BER.

